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Patent Searching and Data


Matches 301 - 350 out of 11,423

Document Document Title
WO/1995/018994A1
A process is disclosed for correcting a non-linear relation between the electric phase angle and the mechanical output angle of step motors by using a low resolution encoder or the like. This process represents a compromise between the c...  
WO/1995/017038A1
A light beam, which scans in opposite directions across a bar code (24), is controlled in velocity and scan angle by monitoring the voltage across a winding (12) of a motor (10), such as one of the phase windings (12) of a two phase step...  
WO/1995/014327A1
The proposed drive circuit for an electronically switched electric motor such as a stepping motor comprises a full bridge circuit (I, II) for each motor winding (L1, L2), a current sensor resistance (R), a storage unit (C5) for storing m...  
WO/1995/009104A1
A bag neck tying device for tying a ribbon (15) dispensed from a spool (41) about a gathered neck. A pulley (24) and proximity switch (86) are mounted to prevent the completion of a tying cycle if a bag neck is not properly gathered and ...  
WO/1994/008279A1
A process for rapidly controlling a step motor without step losses should at the same time allow a high resolution to be obtained at the target. A step angle table precalculated for the specific system gives per interval/step the step an...  
WO/1994/007289A1
The proposal is for a process and a circuit arrangement for electronically monitoring overloads on electric motor drives in which speed monitoring is used as well as the prior art method of true output monitoring. This also makes it poss...  
WO/1993/023918A1
A variable reluctance drive system including a motor and corresponding converter for improved current commutation. The motor incorporates a salient pole rotor (16) and a salient pole stator (10) having one or more full pitch windings (20...  
WO/1993/020441A1
An automated, continuous and random access analytical system, having apparatus and methodology capable of simultaneously performing multiple assays of liquid samples using different assay methodologies, and providing continuous and rando...  
WO/1993/016520A1
A drive circuit for a stepper motor intended to drive a load, which circuit is adapted to operate in a chopper drive mode during a motor acceleration phase, and in an L/R drive mode during a subsequent cruise phase.  
WO/1993/009596A1
An improved control system for a stepper motor coil (190) includes a flyback circuit (192) that dissipates coil energy slowly while the coil is energized and operated in the chopping mode, while dissipating coil energy rapidly when the c...  
WO/1992/020143A1
A method for generating stepper motor ramps and analyzing the motor torque required compared with the motor torque available wherein the generated ramp will accelerate the motor as fast as possible while maintaining a user settable torqu...  
WO/1992/016047A1
An apparatus for performing numerical control of a load at a high speed efficiently. The apparatus drives a linked load, as a DC motor, in the initial period of the movement of the load, and then, generates a braking torque to decelerate...  
WO/1992/008277A1
A control system for driving a low torque synchronous motor is described which drives the motor to have a smooth rotation. The windings of the motor are energised whereby to provide a motive magnetic field which is dependent on the angul...  
WO/1991/013490A1
A control circuit for a stepping motor (20) comprises a transistorised drive circuit (122) having a plurality of switching positions in each of which the drive circuit (122) is arranged to supply current to selected windings of the stepp...  
WO/1991/011851A1
The device comprises transistors (T1, T2, T3, T4) each connected in series with one of the phases (o1, o2, o3, o4) of the stator of the motor in order to control its power supply by an electrical energy source (+VBAT). Means (D1, D2, D3,...  
WO/1991/010946A1
The present invention provides a drive signal for a peristaltic pump motor (42). A first circuit is provided which generates a first series of pulses (SF) at a given frequency. A second circuit is provided which generates a second series...  
WO/1991/008391A1
Described is a stepper motor (1a) in which, in order to operate a throttle valve (2), each pole coil is divided into part-coils (13-16), each of which is controlled by an individual output stage (31). This makes it possible to continue t...  
WO/1991/007811A1
A position monitor (20) is provided for use in conjunction with a stepper motor (10) wherein two inputs (22, 24) are provided to the monitor from the stepper motor phase windings. A first signal (I) is provided which indicates, by pulses...  
WO/1991/007009A1
A unipolar motor control system includes motor current regulation derived from monitoring battery voltage and motor temperature. The monitored battery voltage and motor temperature are input to a microprocessor control which has one or m...  
WO/1990/015476A1
A driving system capable of producing large driving force to drive a load and positioning it rapidly with high accuracy by use of a controller capable of driving a motor at a high speed with high torque and high efficiency. When target p...  
WO/1990/001231A1
A motor is disclosed comprising a housing (5) and a plurality of parallel stator laminations (4) mounted on the interior wall of the housing surrounding the rotor (3). The stator (4) comprises a plurality of coils (28) wound around the s...  
WO/1989/008349A1
Two-state, bilateral, single-pole, double-throw, half-bridge power-switching apparatus capable of high speed, high current switching over a duty factor range of 0 % to 100 % includes a single-wire connector (104) to a source (101) of swi...  
WO/1989/007789A1
A digital follow-up system comprises a synchronous machine (1), on the shaft (2) of which is mounted a position pick-up (3) connected through its output (4) to a unit (6) for determining the code of the displacement angle between the act...  
WO/1989/007859A1
High resolution microstepping of a unipolar d.c. motor (18) is accomplished by applying from a look-up table the values of the SINE and COSINE of a given angle to the control circuit of a unipolar d.c. motor. The difference between the p...  
WO/1989/005539A1
In driving motors for continuous and positioning operation, two different types of rotor, corresponding to the type of operation, are controlled by two different stators. The driving motor (1) according to the invention is of simple desi...  
WO/1989/004085A1
A method and apparatus for controlling stepmotors (24, 124) having a broad range of applications including fuel control for gas-turbine engines, and operating powered automatically controlled doors (140) for mass transit vehicles is disc...  
WO/1988/008641A1
A control system for a stepping motor includes first and second pairs (W1, W2) of complementary windings. The windings are coupled via respective switching devices (T3-T6) to ground, a low voltage source is coupled via diodes (CR6, CR7) ...  
WO/1988/005185A1
An apparatus and method for operating a plurality of stepper motors (95). A controller operates a plurality of sequentially connected stepper motors (95) executing substantially the same motion. The apparatus includes an incremental cont...  
WO/1987/005755A1
A device for detecting the rotational position of the rotor of a motor, which is capable of detecting the absolute rotational position of the rotor shaft of the motor over one turn of the rotor shaft, and which is also capable of detecti...  
WO/1985/004269A1
A permanent magnetic stepper motor (10) apparatus which provides high constant torque and constant speed through a large stepping angle under varying output shaft load conditions. The apparatus includes a rotor (12), a plurality of stato...  
WO/1985/004061A1
A novel method of controlling a stepping motor comprises applying pulsed power (P1, P2) to one or two phases (1, 2) of the motor for variable pulse duration varied according to a programme in successive steps (P1, P2; P5, P3; P6, P4), th...  
WO/1985/000708A1
The method includes varying the width of the high level drive impulses of a bi-level drive system based on the desired speed to be achieved by the stepper motor. A microprocessor is used to vary the pulse width.  
WO/1984/003013A1
A "H" switching circuit (10) for providing current drive to a load coupled between first (20) and second (22) outputs thereof comprising first and second paired switching transistor circuits each including an upper transistor (12:16) tha...  
WO/1983/002695A1
A stepper motor control circuit includes a waveform generator circuit (301, 302, 303, 304, 305) which produces two identical substantially stepless symmetrical waveforms (preferably of triangular configuration) at a frequency which can b...  
WO/1983/001156A1
The electric machine according to the invention comprises an iron-free rotor provided with two windings (1, 2) each of them being formed by a plurality of coil elements (11, 12, 13 and 21, 22, 23). The elements (11, 12, 13) of the first ...  
WO/1983/000571A1
An adaptive motor pulsing apparatus (36) for a driven element (32) positioning system which divides the available time between recurring motor (36) on periods and motor (36) off periods, and which also varies the duty cycle of the motor ...  
WO/1982/002962A1
Microprocessor controlled micro-stepping chart drive circuit. The invention comprises a step clock system (10), a microprocessor controller (12) and a motor drive circuit (16). A speed selector (14) establishes a numerical constant withi...  
WO/1982/002127A1
A digital servo control system for a d.c. motor (20) to achieve stepping motor precision and a wider speed control range than either a conventional d.c. motor or a stepping motor, as may be typically utilized in an IV syring pump. Motor ...  
WO/1981/002207A1
This control device is used in connection with a motor comprising a magnetic rotor and at least two magnetic stator circuits coupled with respective coils (b1, b2). A logic circuit (21) is arranged to alternatively feed drive pulses to b...  
WO/1981/001084A1
A circuit arrangement for an asynchronous motor drive of controlled stepping, i.e. for control of the number of revolutions of asynchronous squirrel-cage motors, in which the output of the supply unit is connected to a potentiometer, the...  
WO/1980/002461A1
Electronic circuits mounted on printed circuit boards, particularly circuits used for television receivers, are placed on a palette which is transferred by a conveyer. During transfer, test probes check whether or not the necessary parts...  
WO/1980/002492A1
A driving apparatus for a plurality of pulse motors for simultaneously carrying out adjustments of a plurality of adjusting points which are interdependent. Driving devices (222X to 222Z) that are rotatably driven by a plurality of pulse...  
JP6694271B2  
JP2020068635A
[Subject] Two or more sets of motors are driven efficiently. [Means for Solution] A motor drive unit is provided with driving circuit part 1 to which it comes mutually to carry out multiple connection of the series circuit unit n-tuple w...  
JP6690331B2  
JP6685256B2  
JP2020060301A
[Subject] While controlling generating of particle, the flow of [ fluid ] is controlled with sufficient accuracy. [Means for Solution] Valve seat part 21 which has flat valve seat side 21a arranged in a position which counters valve elem...  
JP2020048322A
[Subject] Motor driving which can inhibit influence of a noise to a motor generated in the case of switching is provided. [Means for Solution] According to this embodiment, motor driving is provided with the following. Driving circuit pa...  
JP2020048362A
[Subject] A Prolapse tone of actuators, such as a motor, is avoided with simple composition. [Means for Solution] In motor driving, CPU101 controls motor Dr106 according to a control signal, and drives motor 1. Magnetic sensor 8 has dete...  
JP6667925B2  

Matches 301 - 350 out of 11,423